Improper Restriction of Excessive Authentication Attempts in OpenEMR - #VU149483
Published: September 14, 2026
Vulnerability identifier: #VU149483
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-307
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive patient information and perform patient-facing actions.
The vulnerability exists due to improper restriction of excessive authentication attempts in the PIN-validation branch of OneTimeAuth.php::processOnetime() when validating login PIN values for an invoice token. A remote attacker can submit repeated PIN guesses with a captured invoice token to disclose sensitive patient information and perform patient-facing actions.
Invoice tokens may remain valid for up to 14 days.
Affected software
OpenEMR
Remediation
Install security update from vendor's website.
OpenEMR - update to 8.4.0